Alloy



Patented Dem 16,1930 I I UNITED STATES PATENT OFFICE.

No Drawing. Applicationfiled November 12, 1929. Serial No. 406,722.

This invention relates to an alloy of copreadily obtained substantially free from per, zinc and manganese in such proportions porosity. as to provide a high degree of ductility and It will be understood that inert impurities resistance to crystallization andbfatigue. or additions which do not injuriously affect Metals and alloys of various kinds are the good qualities of the alloy composition commonly employed in the construction of may be present in association with the coptubes, strips, diaphragms, bellows and the per, manganese. and zinc, which are the eslike, in situations requiring a certain amount sential components by which the properties of flexibility. One example of'such use is in of the alloy are determined.

1o 'themostatic apparatus where there is a I claim Y movement required for opening and closing 1. An alloy comprising at least 88% cop- Valves, and the metal or alloy is formed into per, to 4% manganese, and the balance bellows, or corrugated or coiled so as to exzinc. pand. and contract with changes in tempera- 2. An alloy comprising 93 to 95% copper,

15 ture. Another example of such use is in ap- 1 to 1 4% manganese, and the balance zinc. paratus conveying liquids, gases, vapors, J. NEWTON WHITE. etc., such as oil to bearings or movable parts, gasoline to tanks or mixture receptacles, V steam or oil tomoving parts, and air or gas 20 to. molding apparatus. Many. other uses 7 1 which necessitate a connection that is flexible or semi-flexible are familiar to those skilled in this art. In all such cases it is of great importance to construct such parts of 25 a metal or alloy which has to a high degree a the property of resisting'crystallization and fatigue under the conditions of operation.

The alloy which forms the subject matter of the present invention is intended primar-- 52o ily for use in apparatus such as above del scribed, but it will of course be obvious that its utiligy is in no sense restricted to this par- 'ticular eld. The alloy contains a high percentage of copper with smaller percentages of zinc and manganese, as essential com- .ponents, the copper representing .at' least 88%, the manganese to 4%, and the balance zinc. r I l A particularly favorable composition for 10 the manufacture of corrugated tubing contains 93 to 95% copper, 1 to 1 4% manganese, and the balance zinc. This mixture or composition showed decided superiority and uniformity of results when subjected to vibra- 45 tory tests in comparison with commercial I 95 brass compositions.

These compositions in accordance with the invention are of good mechanical strength, offer a high degree of ductility and resist- 50 ance to crystall zation and fatigue, and are I 

